Simpler changed check

[ionelmc]

It would appear that this doesn't really work well with crazy MultiValueField-based fields. Not sure if my field is the problem or nango but I wonder - wouldn't it just be simpler to have a timestamp-based check on a auto_now-datetime field?

Anyway ... so my field is something like this:

class SplitDateTimeRangeField(forms.MultiValueField):
    empty_values = validators.EMPTY_VALUES + (
        (None, None),
        DateTimeTZRange(None, None),
    )

    def __init__(self, **kwargs):
        fields = (
            forms.SplitDateTimeField(),
            forms.SplitDateTimeField(),
        )
        super().__init__(fields, **kwargs)
        self.range_field = pgforms.DateTimeRangeField(**kwargs)

    def validate(self, value):
        if value in self.empty_values and self.required:
            raise ValidationError(self.error_messages['required'], code='required')

    def compress(self, data_list):
        return self.range_field.compress(data_list)